The ExtremePriceHighlighter (EPH) is a powerful RTX extension that identifies and highlights extreme prices over various periods with respect to volume-at-price data. EPH operates on the volume-at-price data within each bar; it finds the extreme prices over multi-bar periods with options including Last X Days, Last X Bars, and Visible Bars. When Visible Bars is selected, EPH identifies the extreme prices within the visible bars of the chart. The highlighting updates dynamically as you zoom or scroll the chart, or as new bars form in real-time.